Use system's RT_ROUNDUP and RT_ADVANCE macros instead of local copies.
[dragonfly.git] / sys / netgraph7 / eiface / ng_eiface.c
CommitLineData
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1/*-
2 *
3 * Copyright (c) 1999-2001, Vitaly V Belekhov
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice unmodified, this list of conditions, and the following
11 * disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD: src/sys/netgraph/ng_eiface.c,v 1.39 2007/07/26 10:54:33 glebius Exp $
29 */
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/errno.h>
34#include <sys/kernel.h>
35#include <sys/malloc.h>
36#include <sys/mbuf.h>
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37#include <sys/sockio.h>
38#include <sys/socket.h>
39#include <sys/syslog.h>
40
41#include <net/if.h>
42#include <net/if_types.h>
92598697 43#include <net/ifq_var.h>
b06ebda0 44#include <net/netisr.h>
4ff4d99f 45#include <net/route.h>
b06ebda0 46
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47#include <netgraph7/netgraph.h>
48#include <netgraph7/ng_message.h>
49#include <netgraph7/ng_parse.h>
5a975a3d 50#include "ng_eiface.h"
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51
52#include <net/bpf.h>
53#include <net/ethernet.h>
54#include <net/if_arp.h>
55
56static const struct ng_cmdlist ng_eiface_cmdlist[] = {
57 {
58 NGM_EIFACE_COOKIE,
59 NGM_EIFACE_GET_IFNAME,
60 "getifname",
61 NULL,
62 &ng_parse_string_type
63 },
64 {
65 NGM_EIFACE_COOKIE,
66 NGM_EIFACE_SET,
67 "set",
68 &ng_parse_enaddr_type,
69 NULL
70 },
71 { 0 }
72};
73
74/* Node private data */
75struct ng_eiface_private {
76 struct ifnet *ifp; /* per-interface network data */
77 int unit; /* Interface unit number */
78 node_p node; /* Our netgraph node */
79 hook_p ether; /* Hook for ethernet stream */
80};
81typedef struct ng_eiface_private *priv_p;
82
83/* Interface methods */
84static void ng_eiface_init(void *xsc);
f0a26983 85static void ng_eiface_start(struct ifnet *ifp, struct ifaltq_subque *);
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86static int ng_eiface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data,
87 struct ucred *cr);
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88#ifdef DEBUG
89static void ng_eiface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
90#endif
91
92/* Netgraph methods */
93static int ng_eiface_mod_event(module_t, int, void *);
94static ng_constructor_t ng_eiface_constructor;
95static ng_rcvmsg_t ng_eiface_rcvmsg;
96static ng_shutdown_t ng_eiface_rmnode;
97static ng_newhook_t ng_eiface_newhook;
98static ng_rcvdata_t ng_eiface_rcvdata;
99static ng_disconnect_t ng_eiface_disconnect;
100
101/* Node type descriptor */
102static struct ng_type typestruct = {
103 .version = NG_ABI_VERSION,
104 .name = NG_EIFACE_NODE_TYPE,
105 .mod_event = ng_eiface_mod_event,
106 .constructor = ng_eiface_constructor,
107 .rcvmsg = ng_eiface_rcvmsg,
108 .shutdown = ng_eiface_rmnode,
109 .newhook = ng_eiface_newhook,
110 .rcvdata = ng_eiface_rcvdata,
111 .disconnect = ng_eiface_disconnect,
112 .cmdlist = ng_eiface_cmdlist
113};
114NETGRAPH_INIT(eiface, &typestruct);
115
92598697 116static int ng_eiface_next_unit;
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117
118/************************************************************************
119 INTERFACE STUFF
120 ************************************************************************/
121
122/*
123 * Process an ioctl for the virtual interface
124 */
125static int
92598697 126ng_eiface_ioctl(struct ifnet *ifp, u_long command, caddr_t data, struct ucred *cr)
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127{
128 struct ifreq *const ifr = (struct ifreq *)data;
92598697 129 int error = 0;
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130
131#ifdef DEBUG
132 ng_eiface_print_ioctl(ifp, command, data);
133#endif
92598697 134 crit_enter();
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135 switch (command) {
136
137 /* These two are mostly handled at a higher layer */
138 case SIOCSIFADDR:
139 error = ether_ioctl(ifp, command, data);
140 break;
141 case SIOCGIFADDR:
142 break;
143
144 /* Set flags */
145 case SIOCSIFFLAGS:
146 /*
147 * If the interface is marked up and stopped, then start it.
148 * If it is marked down and running, then stop it.
149 */
150 if (ifp->if_flags & IFF_UP) {
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151 if (!(ifp->if_flags & IFF_RUNNING)) {
152 ifq_clr_oactive(&ifp->if_snd);
153 ifp->if_flags |= IFF_RUNNING;
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154 }
155 } else {
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156 if (ifp->if_flags & IFF_RUNNING)
157 ifq_clr_oactive(&ifp->if_snd);
158 ifp->if_flags &= ~(IFF_RUNNING);
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159 }
160 break;
161
162 /* Set the interface MTU */
163 case SIOCSIFMTU:
164 if (ifr->ifr_mtu > NG_EIFACE_MTU_MAX ||
165 ifr->ifr_mtu < NG_EIFACE_MTU_MIN)
166 error = EINVAL;
167 else
168 ifp->if_mtu = ifr->ifr_mtu;
169 break;
170
171 /* Stuff that's not supported */
172 case SIOCADDMULTI:
173 case SIOCDELMULTI:
174 error = 0;
175 break;
176 case SIOCSIFPHYS:
177 error = EOPNOTSUPP;
178 break;
179
180 default:
181 error = EINVAL;
182 break;
183 }
92598697 184 crit_exit();
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185 return (error);
186}
187
188static void
189ng_eiface_init(void *xsc)
190{
191 priv_p sc = xsc;
192 struct ifnet *ifp = sc->ifp;
b06ebda0 193
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194 crit_enter();
195
196 ifp->if_flags |= IFF_RUNNING;
197 ifq_clr_oactive(&ifp->if_snd);
b06ebda0 198
92598697 199 crit_exit();
b06ebda0 200
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201}
202
203/*
204 * We simply relay the packet to the "ether" hook, if it is connected.
205 * We have been through the netgraph locking and are guaranteed to
206 * be the only code running in this node at this time.
207 */
208static void
209ng_eiface_start2(node_p node, hook_p hook, void *arg1, int arg2)
210{
211 struct ifnet *ifp = arg1;
212 const priv_p priv = (priv_p)ifp->if_softc;
213 int error = 0;
214 struct mbuf *m;
215
216 /* Check interface flags */
217
218 if (!((ifp->if_flags & IFF_UP) &&
92598697 219 (ifp->if_flags & IFF_RUNNING)))
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220 return;
221
222 for (;;) {
223 /*
224 * Grab a packet to transmit.
225 */
ac9843a1 226 m = ifq_dequeue(&ifp->if_snd);
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227
228 /* If there's nothing to send, break. */
229 if (m == NULL)
230 break;
231
232 /*
233 * Berkeley packet filter.
234 * Pass packet to bpf if there is a listener.
235 * XXX is this safe? locking?
236 */
237 BPF_MTAP(ifp, m);
238
239 if (ifp->if_flags & IFF_MONITOR) {
240 ifp->if_ipackets++;
241 m_freem(m);
242 continue;
243 }
244
245 /*
246 * Send packet; if hook is not connected, mbuf will get
247 * freed.
248 */
249 NG_SEND_DATA_ONLY(error, priv->ether, m);
250
251 /* Update stats */
252 if (error == 0)
253 ifp->if_opackets++;
254 else
255 ifp->if_oerrors++;
256 }
257
92598697 258 ifq_clr_oactive(&ifp->if_snd);
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259
260 return;
261}
262
263/*
264 * This routine is called to deliver a packet out the interface.
265 * We simply queue the netgraph version to be called when netgraph locking
266 * allows it to happen.
267 * Until we know what the rest of the networking code is doing for
268 * locking, we don't know how we will interact with it.
269 * Take comfort from the fact that the ifnet struct is part of our
270 * private info and can't go away while we are queued.
271 * [Though we don't know it is still there now....]
272 * it is possible we don't gain anything from this because
273 * we would like to get the mbuf and queue it as data
274 * somehow, but we can't and if we did would we solve anything?
275 */
276static void
f0a26983 277ng_eiface_start(struct ifnet *ifp, struct ifaltq_subque *ifsq __unused)
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278{
279
280 const priv_p priv = (priv_p)ifp->if_softc;
281
282 /* Don't do anything if output is active */
92598697 283 if (ifq_is_oactive(&ifp->if_snd))
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284 return;
285
92598697 286 ifq_set_oactive(&ifp->if_snd);
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287
288 if (ng_send_fn(priv->node, NULL, &ng_eiface_start2, ifp, 0) != 0)
92598697 289 ifq_clr_oactive(&ifp->if_snd);
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290}
291
292#ifdef DEBUG
293/*
294 * Display an ioctl to the virtual interface
295 */
296
297static void
298ng_eiface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
299{
300 char *str;
301
302 switch (command & IOC_DIRMASK) {
303 case IOC_VOID:
304 str = "IO";
305 break;
306 case IOC_OUT:
307 str = "IOR";
308 break;
309 case IOC_IN:
310 str = "IOW";
311 break;
312 case IOC_INOUT:
313 str = "IORW";
314 break;
315 default:
316 str = "IO??";
317 }
318 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
319 ifp->if_xname,
320 str,
321 IOCGROUP(command),
322 command & 0xff,
323 IOCPARM_LEN(command));
324}
325#endif /* DEBUG */
326
327/************************************************************************
328 NETGRAPH NODE STUFF
329 ************************************************************************/
330
331/*
332 * Constructor for a node
333 */
334static int
335ng_eiface_constructor(node_p node)
336{
337 struct ifnet *ifp;
338 priv_p priv;
339 u_char eaddr[6] = {0,0,0,0,0,0};
340
341 /* Allocate node and interface private structures */
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342 priv = kmalloc(sizeof(*priv), M_NETGRAPH,
343 M_WAITOK | M_NULLOK | M_ZERO);
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344 if (priv == NULL)
345 return (ENOMEM);
346
347 ifp = priv->ifp = if_alloc(IFT_ETHER);
348 if (ifp == NULL) {
5a975a3d 349 kfree(priv, M_NETGRAPH);
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350 return (ENOSPC);
351 }
352
353 /* Link them together */
354 ifp->if_softc = priv;
355
356 /* Get an interface unit number */
92598697 357 priv->unit = ng_eiface_next_unit++;
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358
359 /* Link together node and private info */
360 NG_NODE_SET_PRIVATE(node, priv);
361 priv->node = node;
362
363 /* Initialize interface structure */
364 if_initname(ifp, NG_EIFACE_EIFACE_NAME, priv->unit);
365 ifp->if_init = ng_eiface_init;
92598697 366/*
b06ebda0 367 ifp->if_output = ether_output;
92598697 368*/
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369 ifp->if_start = ng_eiface_start;
370 ifp->if_ioctl = ng_eiface_ioctl;
371 ifp->if_watchdog = NULL;
ef9870ec 372 ifq_set_maxlen(&ifp->if_snd, IFQ_MAXLEN);
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373 ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST);
374
375#if 0
376 /* Give this node name */
377 bzero(ifname, sizeof(ifname));
a62226e4 378 ksprintf(ifname, "if%s", ifp->if_xname);
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379 (void)ng_name_node(node, ifname);
380#endif
381
382 /* Attach the interface */
92598697 383 ether_ifattach(ifp, eaddr, NULL);
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384
385 /* Done */
386 return (0);
387}
388
389/*
390 * Give our ok for a hook to be added
391 */
392static int
393ng_eiface_newhook(node_p node, hook_p hook, const char *name)
394{
395 priv_p priv = NG_NODE_PRIVATE(node);
396 struct ifnet *ifp = priv->ifp;
397
398 if (strcmp(name, NG_EIFACE_HOOK_ETHER))
399 return (EPFNOSUPPORT);
400 if (priv->ether != NULL)
401 return (EISCONN);
402 priv->ether = hook;
403 NG_HOOK_SET_PRIVATE(hook, &priv->ether);
404
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405 ifp->if_link_state = LINK_STATE_UP;
406 if_link_state_change(ifp);
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407
408 return (0);
409}
410
411/*
412 * Receive a control message
413 */
414static int
415ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook)
416{
417 const priv_p priv = NG_NODE_PRIVATE(node);
418 struct ifnet *const ifp = priv->ifp;
419 struct ng_mesg *resp = NULL;
420 int error = 0;
421 struct ng_mesg *msg;
422
423 NGI_GET_MSG(item, msg);
424 switch (msg->header.typecookie) {
425 case NGM_EIFACE_COOKIE:
426 switch (msg->header.cmd) {
427
428 case NGM_EIFACE_SET:
429 {
430 if (msg->header.arglen != ETHER_ADDR_LEN) {
431 error = EINVAL;
432 break;
433 }
434 error = if_setlladdr(priv->ifp,
435 (u_char *)msg->data, ETHER_ADDR_LEN);
436 break;
437 }
438
439 case NGM_EIFACE_GET_IFNAME:
5a975a3d 440 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_WAITOK | M_NULLOK);
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441 if (resp == NULL) {
442 error = ENOMEM;
443 break;
444 }
445 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
446 break;
447
448 case NGM_EIFACE_GET_IFADDRS:
449 {
92598697 450 struct ifaddr_container *ifac;
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451 caddr_t ptr;
452 int buflen;
453
4ff4d99f 454#define SA_SIZE(s) RT_ROUNDUP((s)->sa_len)
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455
456 /* Determine size of response and allocate it */
457 buflen = 0;
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458 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid],
459 ifa_link)
460 buflen += SA_SIZE(ifac->ifa->ifa_addr);
5a975a3d 461 NG_MKRESPONSE(resp, msg, buflen, M_WAITOK | M_NULLOK);
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462 if (resp == NULL) {
463 error = ENOMEM;
464 break;
465 }
466
467 /* Add addresses */
468 ptr = resp->data;
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469 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid],
470 ifa_link) {
471 struct ifaddr *ifa = ifac->ifa;
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472 const int len = SA_SIZE(ifa->ifa_addr);
473
474 if (buflen < len) {
475 log(LOG_ERR, "%s: len changed?\n",
476 ifp->if_xname);
477 break;
478 }
479 bcopy(ifa->ifa_addr, ptr, len);
480 ptr += len;
481 buflen -= len;
482 }
483 break;
484#undef SA_SIZE
485 }
486
487 default:
488 error = EINVAL;
489 break;
490 } /* end of inner switch() */
491 break;
492 case NGM_FLOW_COOKIE:
493 switch (msg->header.cmd) {
494 case NGM_LINK_IS_UP:
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495 ifp->if_link_state = LINK_STATE_UP;
496 if_link_state_change(ifp);
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497 break;
498 case NGM_LINK_IS_DOWN:
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499 ifp->if_link_state = LINK_STATE_DOWN;
500 if_link_state_change(ifp);
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501 break;
502 default:
503 break;
504 }
505 break;
506 default:
507 error = EINVAL;
508 break;
509 }
510 NG_RESPOND_MSG(error, node, item, resp);
511 NG_FREE_MSG(msg);
512 return (error);
513}
514
515/*
516 * Receive data from a hook. Pass the packet to the ether_input routine.
517 */
518static int
519ng_eiface_rcvdata(hook_p hook, item_p item)
520{
521 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
522 struct ifnet *const ifp = priv->ifp;
523 struct mbuf *m;
524
525 NGI_GET_M(item, m);
526 NG_FREE_ITEM(item);
527
528 if (!((ifp->if_flags & IFF_UP) &&
92598697 529 (ifp->if_flags & IFF_RUNNING))) {
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530 NG_FREE_M(m);
531 return (ENETDOWN);
532 }
533
534 if (m->m_len < ETHER_HDR_LEN) {
535 m = m_pullup(m, ETHER_HDR_LEN);
536 if (m == NULL)
537 return (EINVAL);
538 }
539
540 /* Note receiving interface */
541 m->m_pkthdr.rcvif = ifp;
542
543 /* Update interface stats */
544 ifp->if_ipackets++;
545
73029d08 546 ifp->if_input(ifp, m, NULL, -1);
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547
548 /* Done */
549 return (0);
550}
551
552/*
553 * Shutdown processing.
554 */
555static int
556ng_eiface_rmnode(node_p node)
557{
558 const priv_p priv = NG_NODE_PRIVATE(node);
559 struct ifnet *const ifp = priv->ifp;
560
561 ether_ifdetach(ifp);
562 if_free(ifp);
fc025606 563 kfree(priv, M_NETGRAPH);
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564 NG_NODE_SET_PRIVATE(node, NULL);
565 NG_NODE_UNREF(node);
566 return (0);
567}
568
569/*
570 * Hook disconnection
571 */
572static int
573ng_eiface_disconnect(hook_p hook)
574{
575 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
576
577 priv->ether = NULL;
578 return (0);
579}
580
581/*
582 * Handle loading and unloading for this node type.
583 */
584static int
585ng_eiface_mod_event(module_t mod, int event, void *data)
586{
587 int error = 0;
588
589 switch (event) {
590 case MOD_LOAD:
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591 break;
592 case MOD_UNLOAD:
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593 break;
594 default:
595 error = EOPNOTSUPP;
596 break;
597 }
598 return (error);
599}